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(1924)
Map of the National Old Trails RoadGrand Canyon Route, open 365 days in the year thru the heart of America ... proposed by the National Old Trails Road Association ... and also advocated by the National Highways Association[Kansas City, Mo. : National Old Trails Road Association],

MLA Citation

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Map of the National Old Trails Road [map] : Grand Canyon Route, open 365 days in the year thru the heart of America ... proposed by the National Old Trails Road Association ... and also advocated by the National Highways Association.